| POWER PROBLEMS [message #2167] |
Thu, 02 April 2009 16:11 |
 dann
Messages: 772
Registered: December 2002
Location: Austin TX |
Senior Member |
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OK, so you built your pedal. It doesn't work.
1) Read COMMON PROBLEMS sticky in the FAQ forum:
http://commonsound.org/fud/index.php?t=msg&goto=2166
2) Now get out your meter. Print out the "TWEAKING POWER" diagram here: http://commonsound.com/other/tweakingpower.pdf
Using the diagram, check the voltages at these places:
A) Voltage at the power jack (measure all pins).
B) Voltage on all three pins of the voltage regulator (7809 or 7805). Center pin should be 0V, one side pin should be 9V (or 5V for 7805). Both the 7805 and the 7809 come in two packages: large (TO-220) and small (TO-92). The large package has its pins numbered 1-2-3 left to right, and the small package is numbered 3-2-1
C) Voltage on the V+ pin of each IC, as follows:
4558, TL072, TL062, 4151, 555: pin 8
4024: pin 14
4049: pin 1
TL074: pin 4
D) Voltage on the ground pin of each IC, as follows:
4558, TL072, TL062, 4151: pin 4
555: pin 1
4024: pin 7
4049: pin 8
TL074: pin 11
Now post that data to the forum!
[Updated on: Sun, 12 April 2009 15:08]
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